Well.. this articole has some points but is not 100% fair or correct. The value of distributed ledger (aka blockchain) is given by the fact that you can find the latest version of a record in a decentralised way. This is usefull outside cryptocurencies (even for university diplomas you need a good mecanism for revocation). You can do revocation with a centralised system but a decentralised version could actualy imprive security and privacy (not with blockchains alone you need encryption and other cryprographic tools)